644315416 has 16 divisors (see below), whose sum is σ = 1226123640. Its totient is φ = 317349120.

The previous prime is 644315407. The next prime is 644315423. The reversal of 644315416 is 614513446.

644315416 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 600505 + ... + 601576.

Almost surely, 2^644315416 is an apocalyptic number.

It is an amenable number.

644315416 is a deficient number, since it is larger than the sum of its proper divisors (581808224).

644315416 is a wasteful number, since it uses less digits than its factorization.

644315416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1202154 (or 1202150 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 644315416 is about 25383.3688859458. The cubic root of 644315416 is about 863.7064725074.

The spelling of 644315416 in words is "six hundred forty-four million, three hundred fifteen thousand, four hundred sixteen".